100+ Ton Air Cooled Chillers
The QTC2 Air-Cooled Scroll Chillers provide chilled water for all air conditioning applications using central station air handling or terminal units. They are completely self-contained and are designed for outdoor (roof or ground level) installations. Each unit includes hermetic scroll compressors, a liquid cooler, air-cooled condenser, a charge of refrigerant R-410A, and a weather resistant microprocessor control center, all mounted on a rugged, formed-steel base.
General Chiller Specifications
The unit is pressure-tested, evacuated, and fully charged with Refrigerant -41 OA and includes an initial oil charge. After assembly, a complete operational test is performed with water flowing through the cooler to assure that the refrigeration circuit operates correctly.
The unit structure is heavy-gauge, galvanized steel. The steel is coated with baked-on powder paint, which, when subjected to ASTM 8117 1000 hour, salt spray testing, yields a minimum ASTM 1654 rating of "6". Corrosion resistant wire mesh panels are added to protect the condenser coil from incidental damage and restrict unauthorized access to internal components. The unit also includes service isolation valves as standard. Units are designed in accordance with NFPA 70 (National Electric Code), ASHRAE/ANSI 15 safety code for mechanical refrigeration, ASME, listed and labeled with Intertek Testing Services (ETL) and rated in accordance with the latest version of AHRI Standard 550/590.
The chiller has suction-gas cooled hermetic, scroll compressors. The compressors incorporate a scroll design that is compliant in both the axial and radial direction. All rotating parts are statically and dynamically balanced. A large internal volume and oil reservoir provide greater liquid tolerance. Compressor crankcase heaters are also included for extra protection against liquid migration.
Brazed plate heat exchangers are UL (Underwriters Laboratories) listed. Installing contractor must include accommodations in the chilled water piping to allow proper drainage and venting of the heat exchanger. Water inlet and outlet connections are grooved for compatibility with factory supplied ANSI/AWWA C-606 connections.
The cooler is equipped with a heater controlled by a separate thermostat. The heater provides freeze protection for the cooler down to -20°F (-29°C) ambient. The cooler is covered with 3/4" (19mm) flexible, closed-cell, foam insulation (K=0.25). A 40 mesh strainer (0.5 and 1.5 mm) is recommended upstream of the heat exchanger to prevent clogging.
Coils - Fin and tube condenser coils of a seamless, internally-enhanced, high-condensing coefficient, corrosion-resistant copper tubes are arranged in staggered rows, mechanically expanded into aluminum fins. Integral sub-cooling is included. The design working pressure of the coil is 650 PSIG (45 bar).
Low Sound Fans- The condenser fans are composed of corrosion resistant aluminum hub and composite blades molded into a low noise airfoil section. They are designed for maximum efficiency and are statically and dynamically balanced for vibration-free operation. They are directly driven and positioned for vertical air discharge. The fan guards are constructed of heavy-gauge, rust-resistant, PVC (polyvinyl chloride)-coated steel wire.
Motors - The fan motors are Totally Enclosed Air-Over, squirrel-cage type, current protected. They feature ball bearings that are double-sealed and permanently lubricated.